<div class="wrapper">
    <div class="button-container">
        <button onclick="updateChart('heatmap')">Heatmap</button>
        <button onclick="updateChart('waterfall')">Waterfall</button>
    </div>
    <div id="myGrid" class="ag-theme-quartz"></div>
    <div id="myChart" class="ag-theme-quartz"></div>
</div>